-3(a-7)=-3(7+8a)

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Solution for -3(a-7)=-3(7+8a) equation: 



-3(a-7)=-3(7+8a)

We move all terms to the left:

-3(a-7)-(-3(7+8a))=0

We add all the numbers together, and all the variables

-3(a-7)-(-3(8a+7))=0

We multiply parentheses

-3a-(-3(8a+7))+21=0



We calculate terms in parentheses: -(-3(8a+7)), so:

-3(8a+7)

We multiply parentheses

-24a-21

Back to the equation:

-(-24a-21)



We get rid of parentheses

-3a+24a+21+21=0

We add all the numbers together, and all the variables

21a+42=0

We move all terms containing a to the left, all other terms to the right

21a=-42

a=-42/21

a=-2

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